Rheumatology 2000; 39: 321-327
© 2000 British Society for Rheumatology
Feasibility and validity of the RADAI, a self-administered rheumatoid arthritis disease activity index
Department of Rheumatology and Institute for Physical Medicine, University Hospital Zurich, Switzerland and
1 Department of Physical Medicine and Rehabilitation, Ludwig-Maximilians University, Munich, Germany
Objective. The goal of the Rheumatoid Arthritis Disease Activity Index (RADAI) is to provide an easy to use assessment of disease activity. It is a self-administered questionnaire that combines five items into a single index: current and past global disease activity, pain, morning stiffness and a joint count.
Methods. A sample of 484 rheumatoid arthritis (RA) patients was used to assess the internal consistency and the convergent validity of the RADAI. This was achieved by calculating Cronbach's alpha and RADAI item and total score correlations with core set measures and DAS28.
Results. Cronbach's alpha was 0.87, supporting the summation of the items into a single index. The index correlated best with physicians' global assessment (r = 0.59; P < 0.0001), the Health Assessment Questionnaire (r = 0.55; P < 0.0001) and the number of tender joints (r = 0.55; P < 0.0001). Correlation with the erythrocyte sedimentation rate was low (r = 0.27; P < 0.0001). The RADAI and the DAS28 were correlated (r = 0.53; P < 0.0001), but there was low agreement.
Conclusions. The RADAI is valid to assess disease activity in RA patients. However, the RADAI may not automatically replace other measures of disease activity, such as the DAS28.
KEY WORDS: Rheumatoid arthritis, Disease activity, Validity, Questionnaire, Index, Outcome.
The members of the Swiss Clinical Quality Management in Rheumatoid Arthritis are: A.-M. Chamot, G. Dalvit, A. Forster, P.-A. Guerne, P. Hasler, D. van Linthoudt, L. Schmid, H. Schwarz, M. Seitz, K. L. So, R. Theiler, P. Villiger and P. Wüest.
Correspondence to: J. Fransen, Universitätsspital, Rheumaklinik und Institut für Physikalische Medizin, Gloriastrasse 25, 8091 Zurich, Switzerland.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  S. Scarpato, M. Antivalle, E. G. Favalli, F. Nacci, S. Frigelli, F. Bartoli, L. Bazzichi, G. Minisola, M. Matucci Cerinic, and RIVIERA co-authors Patient preferences in the choice of anti-TNF therapies in rheumatoid arthritis. Results from a questionnaire survey (RIVIERA study) Rheumatology, November 17, 2009; (2009) kep354v1. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 N. A. KHAN, Y. YAZICI, J. CALVO-ALEN, J. DADONIENE, L. GOSSEC, T. M. HANSEN, M. HUISMAN, R. KALLIKORM, R. MULLER, M. LIVEBORN, et al. Reevaluation of the Role of Duration of Morning Stiffness in the Assessment of Rheumatoid Arthritis Activity J Rheumatol, November 1, 2009; 36(11): 2435 - 2442. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T Karonitsch, D Aletaha, M Boers, S Bombardieri, B Combe, M Dougados, P Emery, D Felson, J Gomez-Reino, E Keystone, et al. Methods of deriving EULAR/ACR recommendations on reporting disease activity in clinical trials of patients with rheumatoid arthritis Ann Rheum Dis, October 1, 2008; 67(10): 1365 - 1373. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. E. Furst, R. J. Halbert, C. O. Bingham III, S. Fukudome, L. Anderson, P. Bonafede, V. Bray, S. B. Cohen, Y. R. S. Sherrer, E. W. S. St Clair, et al. Evaluating the adequacy of disease control in patients with rheumatoid arthritis: a RAND appropriateness panel Rheumatology, February 1, 2008; 47(2): 194 - 199. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. Salaffi, E. Filippucci, M. Carotti, E. Naredo, G. Meenagh, A. Ciapetti, V. Savic, and W. Grassi Inter-observer agreement of standard joint counts in early rheumatoid arthritis: a comparison with grey scale ultrasonography a preliminary study Rheumatology, January 1, 2008; 47(1): 54 - 58. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Bertinotti, F. Nacci, and M. Matucci-Cerinic The measurement of outcome and the rheumatoid arthritis core set to lift the prejudice of the 'thaumaturgus cliche' Rheumatology, September 1, 2006; 45(9): 1055 - 1057. [Full Text] [PDF]
|
|
|
|
|
|
J Fransen, G Stucki, J Twisk, A-M Chamot, J-C Gerster, T Langenegger, M Seitz, B A Michel, and the members of the Swiss Clinical Quality Manageme Effectiveness of a measurement feedback system on outcome in rheumatoid arthritis: a controlled clinical trial Ann Rheum Dis, July 1, 2003; 62(7): 624 - 629. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Fransen, G. Stucki, and P. van Riel The merits of monitoring: should we follow all our rheumatoid arthritis patients in daily practice? Rheumatology, June 1, 2002; 41(6): 601 - 604. [Full Text] [PDF]
|
|
|
|
|
|
J Fransen, D Uebelhart, G Stucki, T Langenegger, M Seitz, and B A Michel The ICIDH-2 as a framework for the assessment of functioning and disability in rheumatoid arthritis Ann Rheum Dis, March 1, 2002; 61(3): 225 - 231. [Abstract] [Full Text] [PDF]
|
|